How can I order magnet from Seen magnet?
Just let us know the size, grade, quantity, surface coating and size tolerance you want.
Then we will provide our best price for your reference.
For example you can send us enquiry like” D25*5 N35 50000pcs Ni-cu-ni +/-0.05″
For your reference our general size tolerance is +/- 0.05, It can be adjusted according to your requirements.
What are the surface coatings for neodymium magnets?
For neodymium magnets, they are often need to be coated with Zn, Ni, NiCuNi,Black Epoxy or White Epoxy and other coatings to protect their surfaces from corrosion and oxidization. But for AlNiCo, SmCo or Ferrite magnets, they commonly do no need to be coated due to their own remarkable resistance against corrosion and oxidization.
Can I get dimension inspection report and BH curve of the magnets?
We can provide inspection report and demagnetization curve (BH curve) to our customers after production.
How to measure the strength of the magnets?
Normally Using a Gauss meter is a easy way to measure the magnetic field density at the surface of the magnet.
This is referred to as the surface field and is measured in Gauss (or Tesla).
Seen Magnet can also provide Gauss meters if you need.
What’s the difference between Permanent Magnets and Electromagnets?
The permanent magnet has magnetism itself. As the nature of permanent magnets, the magnetism will not be eliminated by outside effect. Electromagnets are made of coil and core. When the core is energized, the electromagnet has magnetism and it does not have magnetism when out of energy. Another difference is that the magnetism of permanent magnets does not change, but the magnetism of the electromagnet will change according to the coil turns, current and the material of the core.
Will magnets lose their power over time?
Magnet materials do lose a very small fraction of their magnetism over time.
For Samarium Cobalt materials, for example they have been shown to be less than 1% over a period of ten years.
What’s the shipping method for magnets?
We have different trade terms and shipping method as per different gross weight of the magnets and customer’s requirements. For light weight (0-50kgs), we often ship by express. For a relatively heavy weight (50-100kgs), air shipment is preferred.
For a heavy weight (above 100kgs), sea shipment is suitable due to its low cost.
But if you have particular requirements,we will operate it according to your needs.
Why magnets can not be taken on passenger plane?
According to the civil aviation security checks regulations: strongly magnetized objects that may interfere the normal work of the various instruments on the aircraft are prohibited to be carried by passengers or consigned.
Which payment term do you accept?
For small amount,(for example Sample fee) We accept Paypal and Western Union.
For larger amount transfer(T/T) is the best way.
What’s your delivery port in China?
Generally, our delivery port of air cargo is Hong Kong or Beijing or others, the delivery port of sea shipment is Weihai or Ningbo port. But these all can be adjusted if you have particular requirement on the delivery port.
How do you pack the magnets to ensure shipments safely?
We use carton and steel partition to pack the goods and ensure that every box is firm, secure and non-magnetic in accordance with national and international transportation regulations.
If you have other specific packing requirements, please let us know in advance.